createRGBStyle

This method examines the names of the sample dimensions in the provided coverage looking for
"red...", "green..." and "blue..." (case insensitive match). If these names are not found
it uses bands 1, 2, and 3 for the red, green and blue channels. It then sets up a raster
symbolizer and returns this wrapped in a Style.

Parameters:

reader -

Returns:

a new Style object containing a raster symbolizer set up for RGB image